Ratios of charged antiparticles to particles near mid-rapidity in Au+Au collisions at sqrt(sNN) = 130 GeV
Abstract
We have measured the ratios of antiparticles to particles for charged pions, kaons and protons near mid-rapidity in central Au+Au collisions at sqrt(sNN) = 130 GeV. For protons, we observe pbar/p = 0.60 +/- 0.04 (stat.) +/- 0.06 (syst.) in the transverse momentum range 0.15 < pT < 1.0 GeV/c. This leads to an estimate of the baryo-chemical potential muB of 45 MeV, a factor of 5-6 smaller than in central Pb+Pb collisions at sqrt(sNN) = 17.2 GeV.
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